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This article mainly explains "what is the difference between static variables and instance variables in Java development". The content in the article is simple and clear, and it is easy to learn and understand. Please follow Xiaobian's train of thought to study and learn "what is the difference between static variables and instance variables in Java development".

The difference when the program is running: the instance variable belongs to the properties of an object, and the instance object must be created before the instance variable can be allocated space to use this instance variable. Static variables do not belong to an instance object, but belong to a class, so they are also called class variables. as long as the program loads the bytecode of the class and does not have to create any instance objects, the static variable will be allocated space, and the static variable can be used. In short, instance variables must create an object before they can be used through this object, while static variables can be referenced directly by the class name.

For example, for the following program, only one staticVar variable is always assigned no matter how many instance objects are created, and the staticVar is incremented by 1 for each instance object created; however, for each instance object created, an instanceVar is allocated, that is, multiple instanceVar may be allocated, and the value of each instanceVar is only incremented once.

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